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November 4, 1970 Morton No~ich Bonded Carbon Plugl Bonded carbon (100 x 200 mesh) plugs, submitted by Horton Norwich, were evaluated for cigarette filter efficiency, Since only eleven plugs were provided, only one port of "tar" and chromatographic vapor phase analyse8 were made. Additional physical properties on the plugs and the fabricated cigarettes are also included in this report. Although these devices are called carbon plugs, they are actually cycllnders or sleeves with one end sealed With p~per end the other end open, By placlng the closed end next to the tobacco eolian, smoke m~y be drawn from the per£- pher~l space between the tlpp~ng paper and the carbon into the center of the carbon cycllnder. This technique of smoke filtration supposedly exposes a large surface area to the smoke and is Jlmilar, in peineiple, to the filter used on the YIHI~CLE cigarette. Cigarette fabrication procedure is described below| 1. Tobacco coltmma (65 ~) were obtained by removing filters from con- ditioned, average weight, TAREYI~N (85) cigarettes. 2. 3. 4. 5. 6. 7. Both black and white segments of TAREYTON tips were removed and the tipping paper sevnd. g I ~ wide collar of rubber tubing yes fitted around the open end of the carbon plug. The plug plus the collar, which was approxinately 1 mm thick, was snuggly inserted inside the 20 m tippin8 paper cylinders. The sealed end of the bonded plug was flush with tipping paper edge. A 5 mm segment of estron was placed inside the tipping paper next to the open end of the carbon plug. Pressure drop and weight of filter assemblies, both with and without citronI were ~lesabred. Filter assemblies ~ere attached to tobacco col~s~ veigbt and pressure drop were again measured. Completed cigarettes were condltloned again at ~ R,N, before smoking. Due to varying lengths of plugs only cigarettes containing 15mm plugs were used for vapor phase ~na[ysls. The rewnining cigarette8 were used for partieu~ete analyain. As sho~rn on the attached summary the test cigarette had a 20 mg "tart'. This corresponds to about 30Z rnduction, compared to a 40-45~ reduction for TAREYTON filters. Vapor phase reduction ~as good; however, equivalent reductions may be obtained with much less carbon.

November 4, 1970 1,1Drton Woz'w~.c'n ~,c)t'~e6 Cs~rbl:,'r, plugs 1, Average weight of all plngs (10), lag 2. Plug lensth and pre6eure drop 3. 15.0' t5.0" 17.0 14.5* 14,0 14.0 15.0" 13.0 14.0 Avg. 14.8 250 8.1 6.0 6.7 5.4 7.1 8.5 8.9 5.7 8.1 6.7 * Ueed for vapor phase analysie. Cigarettes Fabricated for Vapor phase Analysle s. ItJ.CtUt: -I- .L Wgt.¸ of plug, ng 254 245 Wgt, Filter Assembly (5~n Eetron),mg 342 349 Wgt. Tobacco Columns (65mm),mg 663 837 NSt, Cigarette, mg 1,205 1.206 Cists/4 oz. b. .~¢.¢,.ECq.¢.¢ ,IL~ ~ Pressure Drop of Ping, Collar & Tipping. cm Pro|sure Drop Df Filter .~ssembly (5~ Estron), c~ Pressure Drop of DIJ;arette~ cm Pressure Drop of Filter Assembly After 8moklus, cm 4. ~ar" and Nicotine (5 cigarettes); 6.1 6.0 7.1 7.2 12.1 12.2 T~, mg/clgt 26 Water, ~;/ctgC 4.1 Nicotine, mg/clgt 1,4 ~a~l, mclc~C 20 254 239 248 332 346 362 877 874 843 1,209 1,220 1,210 94 5.4 5.9 5.9 6.4 7.1 7.0 11.8 12.7 12.2 7.3 8.2 7.8

Morton Norwich Bonded Carbon Plugs -2- November 4, 1970 5, Chrow~tographic Vspor Phase: Without Filter z~ffe/cLgc. 9.0 8.8 Zsopre~e 1.71 0.78 Acetalde~de 2,98 1.54 48 Acetone 1.81 0.76 58 Methanol 0.62 0.04 94 Met~l Fursn 0.12 0.05 58 Furan 0.13 0.04 69 Z~opionalde~de 0.25 0.10 60 Acrolein 0.30 0, t0 67 Met~ Acetate 0.11 0.03 73 I~obutyrelde~yde 0.11 0,04 Metal Ethyl Eetone 0,38 0,15 60 Total 8.52 3.63 57 BFP:pct November 4, 1970